Coax Cable Signal Loss (Attenuation) in dB per 100ft*
Loss*	RG-174	RG-58	RG-8X	RG-213	RG-6	RG-11	RF-9914	RF-9913
1MHz	1.9dB	0.4dB	0.5dB	0.2dB	0.2dB	0.2dB	0.3dB	0.2dB
10MHz	3.3dB	1.4dB	1.0dB	0.6dB	0.6dB	0.4dB	0.5dB	0.4dB
50MHz	6.6dB	3.3dB	2.5dB	1.6dB	1.4dB	1.0dB	1.1dB	0.9dB
100MHz	8.9dB	4.9dB	3.6dB	2.2dB	2.0dB	1.6dB	1.5dB	1.4dB
200MHz	11.9dB	7.3dB	5.4dB	3.3dB	2.8dB	2.3dB	2.0dB	1.8dB
400MHz	17.3 B	11.2dB	7.9dB	4.8dB	4.3dB	3.5dB	2.9dB	2.6dB
700MHz	26.0dB	16.9dB	11.0dB	6.6dB	5.6dB	4.7dB	3.8dB	3.6dB
900MHz	27.9 B	20.1dB	12.6dB	7.7dB	6.0dB	5.4dB	4.9dB	4.2dB
1GHz	32.0dB	21.5dB	13.5dB	8.3dB	6.1dB	5.6dB	5.3dB	4.5dB
Imped	50ohm	50ohm	50ohm	50ohm	75ohm	75ohm	50ohm	50ohm
* Note: Coax losses shown above are for 100 feet lengths. Loss is a length multiplier, so a 200 ft length would have twice the loss shown above and a 50 ft length would have half the loss. This multiplier factor is why you should keep cable installation lengths between radios and antennas as short as practical!

dB Loss Per 100-feet for Various Cables

Cable	15 Mhz	30 Mhz	50 Mhz	150 Mhz
RG-58 foam	1.5	2.15	2.75	4.7
RG-8 foam	.62	.89	1.22	2.15
9913	.5	.72	.92	1.7
1/2" 75ohm hardline*	.3	.45	.62	1.2
3/4" 75ohm hardline*	.23	.35	.46	.87
450ohm ladder line	.01	.1	.135	.26

Actual Power Available at Far End of 100-foot Run
For 100 Watts In * 50 ohm has slightly less loss

Cable	15 Mhz	30 Mhz	50 Mhz	150 Mhz
RG-58 foam	71	62	54	33
RG-8 foam	87	83	72	62
9913	90	84	83	67
1/2" 75ohm hardline*	95	90	87	75
3/4" 75ohm hardline*	95+	94	90	82
450ohm ladder line	100	98	97	95

One Mile of 450 ohm ladder line has .53 dB loss at 15 Mhz

One Hundred Feet of Belden 9913 has .5 dB loss at 15 Mhz